Hello Electric Blue:
Old thread interesting question...
<<not enough power in my right fount Kick. Because I was snapping it back to quickly,and not extending it through the target.
There are two (2) families of kicking, the first is the THRUST kick, the other is the SNAP. There are different opinions as to the power of one or the other type. What you describe are two different creatures.
Regardless of which is used the penetration must go through the surface of the pad, not merely touching its surface skin. It is a learning process for a reason... with enough time you will have good mechanics.